Plant Puzzler What is the energy source that drives photosynthesis? SUN
Sugar (Glucose) C 6 H12O 6 6 Carbon, 12 Hydrogen, 6 Oxygen Glucose is stored energy plants use for food Made from CO2, H2O, Sunlight and chlorophyll
Plant Puzzler The kind of food produced directly from photosynthesis is __________? Sugar = Glucose = C 6 H12O 6
Gas Exchange in Leaves Cuticle: waxy covering that protects plant How does gas “break through” that tough barrier? Stoma! (plural= stomata) an opening in a leaf or stem that allows gas exchange Each stoma has 2 Guard Cells Guard Cells open or close stoma Closed stoma = no gas exchange Open stoma = gas exchange Carbon Dioxide (CO2), Oxygen (O2), and Water Vapor (H2O)
Plant Puzzler An opening in a plant that allows for gas exchange is called a __________? What gases are transported through the stoma? Stoma CO2, O2, H2O
Question #1 Put a plant under a dark box. Is this plant undergoing photosynthesis? Why or why not? http://www.fightingquaker.com/jaropt/table_plant.jpg http://homepage.eircom.net/~pakform/bse_007-3.gif
Question #2 Describe what you think will happen to the life seen here (and on Earth), after a meteor blackened the sky so that no sun could shine through?
Question #3 Are the leaves you see here undergoing photosynthesis? Why or why not? Pretend that the branch is still attached to the living tree.
Question #4 If you and a large tree were locked in an airtight compartment, with plenty of food, water, and nutrients, could you survive? Explain your answer.